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Pecan Scab Advisor
Introduction:
Pecans are the staple of many American traditions; pies during the holidays, ice cream in the summer and delectable chocolates year
round. It’s no wonder more than 134 million pounds of pecans are consumed each year. However, pecans are under attack from pecan
scab infection and if left unchecked, this disease can cause damage to a crop resulting in reduced yield, quality and revenue.
Agweather features a Pecan Scab Advisor that allows pecan growers and industry professionals to track current, seasonal and past
pecan scab hour data. The Pecan Scab Advisor is a decision support tool that has been developed to aid growers in proper timing of
fungicide applications for pecan scab.
Using weather data from the Oklahoma Mesonet, the pecan scab advisor tracks hours when pecan scab risk is high. Using these hours
and knowing the susceptibility of the pecan variety, the grower can decide whether to apply a fungicide spray or not. The threshold for
highly susceptible pecan varieties is 10 hours, for moderately susceptible varieties 20 scab hours, and for natives and low susceptibility
varieties 30 scab hours.
Based on research from Oklahoma pecan orchard sites, the total scab hours during the last 14 days were the critical hours in calcu-lating
disease development. The advisor assumes an applied fungicide will protect the crop for approximately 14 days following the
application.
article revised October 2009
photo by Todd Johnson
How to Use Agweather’s
Scab Hour:
A scab hour is defined as one hour with relative humidity of 90 percent or higher and an air temperature of 70 degrees Fahrenheit or higher.
Pecan Scab Season:
The Pecan Scab Advisor is operational from March 1 through August 31 and is updated hourly. The forecast data is updated four times a day
and is based on forecasts from the National Weather Service.
Highly Susceptible
10 Scab Hours
Moderately Susceptible
20 Scab Hours
Low Susceptibility (resistant)
30 Scab Hours
Burkett Caddo * Native Trees *
Squirrel’s Delight Colby Barton
Western Creek Choctaw
Wichita Giles Graking
Kiowa Kanza
Maramec Lakota
Mohawk Mount
Oconee Nacono
Shawnee Osage
Pawnee Peruque
Stuart
Scab Hour Thresholds:

Pecan Scab Advisor
Introduction:
Pecans are the staple of many American traditions; pies during the holidays, ice cream in the summer and delectable chocolates year
round. It’s no wonder more than 134 million pounds of pecans are consumed each year. However, pecans are under attack from pecan
scab infection and if left unchecked, this disease can cause damage to a crop resulting in reduced yield, quality and revenue.
Agweather features a Pecan Scab Advisor that allows pecan growers and industry professionals to track current, seasonal and past
pecan scab hour data. The Pecan Scab Advisor is a decision support tool that has been developed to aid growers in proper timing of
fungicide applications for pecan scab.
Using weather data from the Oklahoma Mesonet, the pecan scab advisor tracks hours when pecan scab risk is high. Using these hours
and knowing the susceptibility of the pecan variety, the grower can decide whether to apply a fungicide spray or not. The threshold for
highly susceptible pecan varieties is 10 hours, for moderately susceptible varieties 20 scab hours, and for natives and low susceptibility
varieties 30 scab hours.
Based on research from Oklahoma pecan orchard sites, the total scab hours during the last 14 days were the critical hours in calcu-lating
disease development. The advisor assumes an applied fungicide will protect the crop for approximately 14 days following the
application.
article revised October 2009
photo by Todd Johnson
How to Use Agweather’s
Scab Hour:
A scab hour is defined as one hour with relative humidity of 90 percent or higher and an air temperature of 70 degrees Fahrenheit or higher.
Pecan Scab Season:
The Pecan Scab Advisor is operational from March 1 through August 31 and is updated hourly. The forecast data is updated four times a day
and is based on forecasts from the National Weather Service.
Highly Susceptible
10 Scab Hours
Moderately Susceptible
20 Scab Hours
Low Susceptibility (resistant)
30 Scab Hours
Burkett Caddo * Native Trees *
Squirrel’s Delight Colby Barton
Western Creek Choctaw
Wichita Giles Graking
Kiowa Kanza
Maramec Lakota
Mohawk Mount
Oconee Nacono
Shawnee Osage
Pawnee Peruque
Stuart
Scab Hour Thresholds: